Added item about the CGI/1.1 spec online locations, and some more

	text about the FreeBSD/FD_SETSIZE stuff.  (Marc has more to add
	on that particular topic. but I'd already written this - so he
	gets to correct/update my blither ;-)

PR:		931,938


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@78818 13f79535-47bb-0310-9956-ffa450edef68